Gap-filling: choose the suitable words from the box to complete the sentences. Advantage--enjoyable--concentrate--disruptive--radiation--submit--screen--downloaded--distract-- look. 1. A computer or laptop can be your powerful weapon and you can take______of the Internet to support your study. 2. Personal electronic devices which ____students from their class work are banned in most schools. 3. Many of the students prefer to_____their assignment papers to their lecturers online via e-mail or even Facebook. 4. If your smartphone rings while you are learning or working, you cannot______ on your study or work. 5. In this situation when you are annoyed and interfered with your device, it becomes______. 6. The_____ from electronics might harm your brain and cause permanent impact.

Find and correct mistakes in the folowing sentences. 1.My E teacher,who lectures are interesting, is humorous. 2.He is the farmer which I told you about. 3. This is the bride who was built by a famous king 1000 years ago. 4. The cacao tree, that grows in equatorial regions, produces a fruit about the size of a small pineapple. 5. He has a lot of friends E speaking countries, who is a great help for him to learn E.

1.One of the functions of computer,which only some people know is to do_______.(calculate) 2.Voice_______ is the app which helps some types of smartphone attracts customers.(recognize)

Cho 10,2g hh X gồm Mg,Al td với dd HCl dư thu được 11,2l khí (đktc) Tính % vêc khối lượng của Mg,Al trong hh ban đầu

Cho 10g hh 2 kl Mg,Cu tác dụng với dd HCl dư thu được 3,733l khí H2 (đktc) thành phần % khối lượng của Mg trong hh là?

Để điều chế đơn chất halogen từ các hợp chất tương ứng như NaF,NaCl,NaBr,NaI phương pháp điên phân nóng chảy là phương pháp duy nhất dùng để điều chế: A.Br2 B.I2 C.Cl2 D.F2

Cho tam giác ABC có góc B=60° góc C=45° BC=5 tính cosA

Tam giác ABC có AB=5 AC=7 góc BAC=70° thì vecto AB×AC=?